Lightning talks
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Wikimania is supposed to have a bit of an unconference style, and that includes Lightning Talks. These are very short presentations (1 to 5 minutes, including time for a short question) on about just anything that's interesting to the Wikimedia movement. Unlike other Submissions, like normal presentations and talks, applications for lightning talks can be spontaneous – you don't have to submit a proposal in advance, just go to Schedule/Lightning Talks and line up on the microphone!